I'm sure you'll agree with me that a marathon is tough work as is, but while wearing a gas mask? Which reduces oxygen intake by 30 per cent? It's obvious Marine Sgt Jeremy Soles is tough as nails.

He ran the marathon to draw attention to those who can't run themselves—specifically, injured veterans. After 4hrs, 29 minutes and 3 seconds, Soles passed the finish line with the Avon Protection C50 gas mask still strapped on; a backpack feeding him an energy gel through a tube—and he even picked up a Guinness Book of World Records plaudit for himself. [Fox News]